Jobelyn is made from Sorghum bicolor which grows abundantly in many parts of the world. Major component analysis of the raw materials and the finished product showed that the herbal product contains oligomeric and polymeric proanthocyanidin (OPCs) which are a class of flavonoid complexes. They are also referred to as condensed tannins. They were first discovered in 1948 by Jacques Masquelier, who developed and later patented techniques for the extraction of proanthocyanidin from pine needles and grape seeds. They can also be found in apples, coconut, cocoa beans, black currant, green tea, black tea. Cocoa beans contain the highest concentrations.